Dyno Results...Opinions?

[ARbowhunter7]

I ran my work truck again today, and am a little confused (bear with me, as I'm trying to find the printout to upload). It did 622/1186, but makes all the power over 3500 rpm, which verifies what I feel when driving. The curve looks like a nice 450hp truck until 3500, then skyrockets to 600+ and stays fairly steady until 5k. The charger is lit by 2100, but I can't get the powerband down to a useable rpm. Fuel pressure never drops below 40 psi.

1998 12v, NV4500, 4.10, 35's
Weston's 5x14's & 100cc+ DV's
Benched, Dual-Fed 215 pump at 550cc w/ Haisley 5k
66/74/14
Pulls made in 4th, for 1:1.

Anybody have an idea where to start? I'm at a loss.

 

[captain_stabbin]

post up dyno sheet

 

[ARbowhunter7]

post up dyno sheet

Reread post, and I was fairly descriptive regarding the curve.

 

[DDually]

Don't know about your problem but your numbers give me high hopes for my setup with bigger injectors! Nice numbers.

 

[NickTF]

Where is your timing? I'm thinking alot of it has to do with dynoing in 1:1 as most dyno via OD.

 

[DISTURBED]

Does that pump have the retard notches in the plungers? Wondering if its leaning it out on top.

 

[ARbowhunter7]

Timing is set at 20*. I'll run in 5th next pull and see what it does.

 

[ARbowhunter7]

Does that pump have the retard notches in the plungers? Wondering if its leaning it out on top.

It does have the retard notches, but that never crossed my mind. I appreciate the suggestion; let me do some poking around and I'll report back. Thanks.

 

[RonA]

Dyno in OD. Loads the engine better and allows the charger time to come up.

 

[NickTF]

Timing is set at 20*. I'll run in 5th next pull and see what it does.

Ok, in that case I would definitely suspect the 1:1 dyno as the issue.

 

[BRE]

New style of traction control?